First question is about light. I read a lot of good about using CFL for plants and what do you think - system of 24+40W CFLs will be enough for Heliamphora minor and epiphytic Utricularias ( predicted distance between end of lamp and pot surface is near 10 cm)?

And second - I use distilled water for my plants, but it's pH sometimes is not low. Have I change it by adding acids(for example acetic or succinic)? And if yes, will all CP like this water?

The tap water here has high pH (7.5-7.8) but fairly low TDS (50-60ppm if I recall correctly). My butterworts, sundews and pitcher plants don't seem to mind. As long as the conductivity/TDS is low I wouldn't worry about it.

pH of a Distilled water should not be low - it should be more or less neutral (pH 7 should have absolutelly pure H2O). It will become acid or alkaline in contact with some source of H+ or OH- ions. The most important is, that its conductivity is low - it indicates, that it contains only a little salts and other things.

The tap water here has high pH (7.5-7.8) but fairly low TDS (50-60ppm if I recall correctly). My butterworts, sundews and pitcher plants don't seem to mind. As long as the conductivity/TDS is low I wouldn't worry about it.

I think it's probably sharp sand. Though, many don't use sand and use perlite instead. A word of caution about sand - I have been having a few issues with plants in peat:sand mix recently and performed a little test on the 'lime-free' horticultural grade sand I have been using. I poured some diluted lactic acid on it and it fizzed like crazy, for a long time, with large pieces or grit fizzing to the surface. This must mean that the sand I have contains alkaline materials!